autopostback

Cannot get the uploaded file name while using ajax

由 亡梦爱人 提交于 2019-12-12 01:06:10
问题 I am using Ajax file upload control to upload file in which it works fine but when i a check box or radiobutton which has autopostback property set to true and I check then the FileName returns value null protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e) { try { if (AsyncFileUpload1.IsUploading) { AsyncFileUpload1.SaveAs(MapPath("~/Images/Accounts/" + AsyncFileUpload1.FileName)); } } catch (Exception ex) { } } after uploading then

RequiredFieldValidator doesn't work when submitting form after Posting back by TextChanged event to the Textbox

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-11 01:07:53
问题 In my .aspx form I have a text box with Autopostback=True . I also set a RequiredFieldValidator next to it. But when Posting back by TextChanged event of my text box, my RequiredFieldValidator appears but still I can submit my form with nothing in the text box! What is wrong, and how can I fix this? 回答1: You have to set the textbox's CausesValidation property to true (it's set to false by default for textboxes). 回答2: Give both the text box and the submit button the same validation group. 回答3:

Validation Message still show up when an autopostback dropdownlist fires

由 你离开我真会死。 提交于 2019-12-10 15:46:03
问题 I have a required field validator to validate a dropdownlist. this dropdownlist is an autopostback one, and it's causevalidation property is set to be false. the issue is, when I select the default item, the validation message shows, but the still do the postback. And after the postback, the message disappers. here is the snippet of codes: <asp:RequiredFieldValidator ID="ContactMethodRequired" runat="server" ControlToValidate="ContactPreferences" Display="Dynamic" ErrorMessage="Please choose

Asp.NET DropDownList Resets SelectedIndex after PostBack

由 假装没事ソ 提交于 2019-12-09 17:21:46
问题 After doing a lot of research online I'm still stumped by this problem. I have a page that loads the names and count of categories into a drop down list. I only do this if !(Page.IsPostBack) . When AutoPostBack fires the SelectedIndex = 0 . I've tried several different things. Here is my code: PAGE <form id="AddAssignmentForm" runat="server"> <asp:ScriptManager ID="ScriptManager1" EnablePartialRendering="true" runat="server" /> <asp:UpdatePanel ID="CommentUpdate" runat="server">

ASP.NET AutoPostBack and then Back Button weird occurrence

由 限于喜欢 提交于 2019-12-06 15:32:27
To keep this simple, I have a dropdownlist and a button in an ASP.NET form. The dropdownlist has an autopostback function that calls DropDownList1_SelectedIndexChanged and the page is redirected somewhere (for this example www.google.com) and the button has an onclick that goes to Button1_Click1 and the page gets redirected to www.yahoo.com. The Problem: If I click the button, I go to Yahoo, which is what you'd expect. If I click back button in my browser and select the dropdownlist I go to Google which is also correct but if I click the back button and then click the button I get redirected

Textbox asp.net postback trigger twice on autopostback true

由 血红的双手。 提交于 2019-12-02 19:30:33
问题 On textbox OnTextChanged event the postback cycle triggering twice. Breakpoints on both methods to understand the issue. Here is my code sample <form id="form1" runat="server"> <div> <asp:TextBox runat="server" ID="TextBox1" OnTextChanged="TextBox1_TextChanged" AutoPostBack="true" /> </div> <asp:Label ID="Label1" runat="server"></asp:Label> </form> Its code behind. public static int cycle { get; set; } protected void Page_Load(object sender, EventArgs e) { } protected void TextBox1

DropdownList autoposback after client confirmation

由 不打扰是莪最后的温柔 提交于 2019-11-30 18:24:59
问题 I have a dropdownlist with the autopostback set to true. I want the user to confirm if they really want to change the value, which on post back fires a server side event (selectedindexchanged). I have tried adding an onchange attribute "return confirm('Please click OK to change. Otherwise click CANCEL?';") but it will not postback regardless of the confirm result and the value in the list does not revert back if cancel selected. When I remove the onchange attribute from the DropdownList tag,

C# How to set the autopostback property when using asp.net mvc?

由 喜欢而已 提交于 2019-11-30 11:04:06
I am using asp.net MVC framework. On my page i have a dropdwonbox and when an option is clicked i want to go to another page. But i can't find how/where to set the autopostback property to true. This is the code i'm using: Aspx: <%= Html.DropDownList("qchap", new SelectList( (IEnumerable)ViewData["qchap"], "Id", "Title" )) %> Controller: public ActionResult Index(int id) { Chapter c = new Chapter(); ViewData["qchap"] = c.GetAllChaptersByManual(id); return View(); } What do i have to do to use the autopostback functionality? You can use the onchange client event: <%= Html.DropDownList("qchap",

How to avoid UpdatePanel scrolling on AutoPostBack?

由 醉酒当歌 提交于 2019-11-30 09:11:41
I have an ASP.NET FormView within an updatepanel. I'm auto-saving the form by setting AutoPostBack=true for each of the items within the FormView. This means the user can click a few elements in quick succession and fire off a few async postbacks almost simultaneously. The issue I have is that the user is able to keep scrolling down the form while the async postbacks are not yet complete. The browser always scrolls back to the position it was in at the first postback. Page.MaintainScrollPositionOnPostback is set to False. I've tried all sorts of things in ajax and jquery with: pageLoad add

ASP.NET DropDownList AutoPostback Not Working - What Am I Missing?

由 删除回忆录丶 提交于 2019-11-29 14:55:42
I am attempting to get a DropDownList to AutoPostBack via an UpdatePanel when the selected item is changed. I'm going a little stir-crazy as to why this isn't working. Does anyone have any quick ideas? ASPX page: <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always" ChildrenAsTriggers="true" > <ContentTemplate> <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" onselectedindexchanged="DropDownList1_SelectedIndexChanged"> <asp:ListItem>item 1</asp:ListItem> <asp:ListItem>item 2</asp:ListItem> </asp:DropDownList> </ContentTemplate> </asp:UpdatePanel> Code
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